Seeking advice on older setup

[albee1952]

Hey all, I am about to install 8HD on an older setup and will be flying blind as to the order of events(especially as a PC guy). Here is what I have:
G5 running Leopard
HD3 PCI cards in a Digidesign chassis(with PCI card in the G5)
Control 24(tested good on my Ultimate rig with neyrinck software)
2x 192 IO's(have all required cables)
Glyph SCSI rackmount with SCSI card in G5(already tested this successfully)
Original iLok with HD8 license(will have this last bit early next week)
8HD installer downloaded
Legacy iLok downloaded
The system currently has 8LE installed(tested successfully with Mbox 1), but I can remove if needed.

Mostly wondering about the order of PT software install vs the chassis connection. Any insights are welcome